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authorStavros Aronis <[email protected]>2015-11-25 13:22:26 +0100
committerBjörn Gustavsson <[email protected]>2016-01-28 14:57:13 +0100
commit4a413c8e8d5d9652c2beabfc7897c87092bd3427 (patch)
treeea32734ffa5a3eadc0f1b0b6c2e468ce6e371ee0 /lib/ssl
parentef19115a637619d719ac96fdbd2262ca62fa8095 (diff)
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Extend cerl_trees:mapfold with a 'pre-order' operation
When manipulating Core Erlang trees it may be useful to perform some operation when a node is visited, before inspecting children nodes. The definition of cerl_tree:mapfold/3 does not allow that, as it applies the given function only after all the recursive calls on the children nodes have been completed. This patch adds a new argument to mapfold: a function that is applied when a node is first entered. As an example of its use, consider the case where one wants to move a 'call' node earlier, by adding 'let' node and replacing the 'call' node with the defined variable. The name of that variable must be specified before one traverses the inner tree (especially if such replacements can be nested).
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